Physics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.6189b&link_type=abstract
Journal of Geophysical Research, vol. 81, Dec. 1, 1976, p. 6189-6192.
Physics
4
Atmospheric Composition, Energy Spectra, Helium Ions, Ion Distribution, Ring Currents, Abundance, Low Altitude, Magnetic Storms, Radiation Belts, Spectrum Analysis
Scientific paper
Tinsley (1976) and Lyons and Evans (1976) have suggested that the near-earth ring current during the recovery phase consists largely of helium ions. In the present paper, an indirect method is proposed for testing the validity of this suggestion. The scheme uses low-altitude particles found near the equator and in the inner zone to identify the ring current ions. Moritz (1972) showed that the low-altitude particles are ions (assumed to be protons) in the energy range between 250 keV and 1.5 MeV. The energy spectrum of these ions depends upon the energy spectrum and the relative abundance of the various ion species as a function of the altitude. Since the pertinent cross sections for hydrogen and helium are very different, and the near-earth portion of the ring current is the primary source of the low-altitude ions, the energy spectrum of these ions depends strongly on the ionic identity of the near-earth current in the energy range between 10 and 100 keV. The energy spectra obtained by Mizera and Blake (1973), do indeed suggest the absence of hydrogen in the near-earth ring current late in the recovery phase.
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